The problem is solved now, thanks to the TP-LINK support. It seems the problem was caused be the firmware update. So, the procedure was to downgrade the firmware to a former one (140716). After that...

Region : Romania Model : Archer C2 Hardware Version : 1 Firmware Version : 141117 ISP : Hi. I have the following problem with my TP-LINK Archer C2. My home network has 2 PCs connected through cable...